Wet Clutch Lifetime Estimation via Slip Heat Release
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional wet clutch systems lack effective means to determine the allowable use limit and fail to provide timely alarms for clutch lifetime expiration, leading to potential damage without protective measures.
Innovation Solution
An alarm device for a wet clutch that calculates heat release during operation based on hydraulic oil pressure and relative circumferential speed, establishing a threshold for clutch damage and lifetime estimation using a Q-N curve, and triggers an alarm when the heat release frequency exceeds predetermined limits, also incorporating a clutch oil pressure regulator to prevent slip operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional wet clutch systems are used without heat release monitoring, then the system structure remains simple, but the clutch lifetime estimation reliability deteriorates and failure protection is unavailable
Solution Approach 1:
The patent introduces hydraulic oil pressure as an intermediary parameter to indirectly measure heat release in the clutch. Instead of directly measuring temperature or heat, the system uses oil pressure changes during clutch engagement and disengagement as a proxy indicator, enabling reliable lifetime estimation without complex thermal sensing equipment.
Solution Approach 2:
The patent replaces complex thermal measurement systems with a mechanical/hydraulic parameter-based approach. By substituting direct temperature measurement with hydraulic oil pressure monitoring, the system achieves reliable clutch state assessment while maintaining structural simplicity and avoiding complex thermal sensing infrastructure.
2Loss of time
If heat release calculation based on hydraulic oil pressure is implemented, then timely alarm capability is improved, but the measurement and detection complexity increases
Solution Approach 1:
The patent makes the hydraulic system serve dual purposes: both clutch actuation and heat release monitoring. The existing hydraulic oil pressure measurements, already necessary for clutch control, are simultaneously utilized to calculate heat release and predict clutch lifetime, eliminating the need for separate measurement systems and enabling timely alarms without additional detection complexity.
3Measurement precision
If clutch lifetime estimation and alarm systems are added, then maintenance timing accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent creates a multi-functional system where the alarm device serves multiple purposes: monitoring clutch engagement states, calculating heat release, estimating lifetime, and triggering maintenance alarms. By making the alarm system universal and integrated with existing hydraulic control functions, the patent achieves precise maintenance timing without proportionally increasing overall device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables accurate clutch lifetime estimation and timely alarms, allowing for proactive maintenance and preventing damage by automatically reducing oil pressure to terminate slip operations, enhancing reliability and safety.
Implementation Method 1
charging or discharging hydraulic oil pressure into or out of the clutch oil chamber
Implementation Method 2
heat release generated in a clutch slip operation
Data Source
AI summary
An alarm device for a clutch that issues an alarm indicating a lifetime expiration of the clutch that selectively connects and disconnects an input shaft to and from an output shaft, includes: a slip heat release threshold setting unit 104 that establishes a threshold criteria as to a clutch damage or the clutch lifetime, in a form of a relation between a heat release generated in a clutch slip operation and a frequency of the heat release occurrences; and a slip heat release calculator 105 that calculates the heat release during the clutch operation, based on a hydraulic oil pressure in an actual clutch operation and a relative circumferential speed between input and output shafts, the alarm device 11 issues the alarm based on the calculation result through the slip heat release calculating means 105 and the slip heat release threshold setting means 104.